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pthread_rwlock_unlock: return EPERM if the caller tries to release a 

rwlock that is write held, but not by the caller.
This commit is contained in:
ad 2007-09-21 16:24:45 +00:00
parent 9212747aea
commit cb10afa05c
1 changed files with 8 additions and 7 deletions
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17
lib/libpthread/pthread_rwlock2.c
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@ -1,4 +1,4 @@
/* $NetBSD: pthread_rwlock2.c,v 1.4 2007/09/21 16:21:54 ad Exp $ */
/* $NetBSD: pthread_rwlock2.c,v 1.5 2007/09/21 16:24:45 ad Exp $ */
/*-
* Copyright (c) 2002, 2006, 2007 The NetBSD Foundation, Inc.
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: pthread_rwlock2.c,v 1.4 2007/09/21 16:21:54 ad Exp $");
__RCSID("$NetBSD: pthread_rwlock2.c,v 1.5 2007/09/21 16:24:45 ad Exp $");
#include <errno.h>
#include <stddef.h>
@ -390,15 +390,16 @@ pthread_rwlock_unlock(pthread_rwlock_t *ptr)
* the read-release and write-release path similar.
*/
owner = (uintptr_t)ptr->ptr_owner;
if ((owner & RW_WRITE_LOCKED) != 0) {
decr = (uintptr_t)self | RW_WRITE_LOCKED;
if ((owner & RW_THREAD) != (uintptr_t)self) {
return EPERM;
}
} else {
decr = RW_READ_INCR;
if (owner == 0) {
return EPERM;
}
if ((owner & RW_WRITE_LOCKED) != 0) {
decr = (uintptr_t)self | RW_WRITE_LOCKED;
pthread__error(EPERM, "releasing rwlock held by another thread",
(owner & RW_THREAD) == (uintptr_t)self);
} else {
decr = RW_READ_INCR;
}
for (;;) {